Charles g



(No Model.) f

C. G. BUCHANAN. MAGNETIC 03B SEPARATOR.

No. 497,117. Patented May 9, 1893.

Filillllllllllllillllllll /N VENTO/L? l YHE noRR1s PE1-:ns cn. wo'raummWASHINGTON, n, a

` UN ITED STATES PATENT OFFICE.

CHARLES G. BUCHANAN, OF NEW YORK, N. Y.

MAGNETIC ORE-SEPARATOR.

SPECIFICATION forming part of Letters Patent No. 497,117, dated'May 9,1893.

Application filed May 17, 1892.

To all whom t may concern:

Be it known that I, CHARLES G. BUCHANAN, a citizen of the United States,residing at the city, county, and State of New York, have invented newand useful Improvements in Magnetic Ore-separators, of which thefollowing is a specification.

My invention relates to the separation of iron in ores or from magneticsands, gangue, or other non-metallic substances, in a dry, pulverizedstate, which separation is effected by the retention of the metallicparticles and the gravitation of the non-metallic particles upon acylinder, or other surface, subject to a magnetic iield.

`In my Letters Patent, No. 466,767, dated February 17, 1891, I describean apparatus wherein the polarity of a series of electromagnets within arevolving drum or cylinder is reversed during the motion of the latter,for the purpose of retaining the particles of ore and dislodging thenon-metallic portions.

` The object of the presentinvention is to accomplish the same purposeby means of stationary magnets of opposite polarity located within arevolving cylinder Whereon metallic `particles are caused to move pastsaid oppositely polarized magnets arranged in alternating succession.

In all prior constructions of magnetic separators with which I amfamiliar and wherein stationary magnets are located within the revolvingcylinder, the exciting coils of the magnets are also Within saidcylinder. Such a construction is open to several serious objections,prominent among which may be noted the inconvenience of such an internalarrangement, and the fact that the friction generated by the revolvingportion tends to heat the wire of the coils, thereby causing a certainrelaXationof the same and rendering them subject to the cutting ordeteriorating action of dust particles, which, under such conditions,more readily work between the strands composing the coils. By my presentinvention, I avoid the difficulties noted by locating the magnetizingcoils external to the revolving drum.

My invention further contemplates a pair of drums, revolving in oppositedirections,

Serial No. 433,348. (No model.)

.each containing a series of fixed magnetic poles of alternatingpolarity, the series of poles of one section being differentiallyarranged with respect to those of the other, whereby the secondaryseries in connection with the relative oppositely rotating drums, actsto operate on the material as soon as it passes beyond the iniiuence ofthe primary series, the result being that the metallic particles arecarried in a direction opposed to the natural gravital tendencyencountered by the gangue or other non-metallic substances beyond thefirst drum. Further, such an arrangement insures a more eectivetreatment since the metallic particles are carried up and over thesecond drum, experiencing a more eX- tended surface treatment than wouldbe possible if both drums revolved in unison.

In the accompanying .drawings forming part of this specification, Figurel, is a vertical, sectional elevation of a'magnetic separator embodyingmy improvements, and Fig. 2, is a horizontal section of Fig. 1, taken inthe plane indicated by the dotted lines w-x, the drum I being insection.

A and B represent magnets located on opposite sides of the apparatus,the legs a, b of which are oppositely wound with insulated magnetizingcoils of wire, so that those of the legs ct, a, form positive poles andthose of b, b', form negative poles. The coils are supplied withcurrents through circuit Wires O, O', and suitable generator D, theconnections being made so that the current will fiow as diagrammaticallyindicated by the dotted lines c, c', and arrows adjacent to the Wires C,C. In the upper portions of the legs a, @,/and b, b, are mounted thestub shafts E, F, for the cylinders, said shafts, as will be readilycomprehended, forming polar extensions of the legs a, b. interposedbetween the inner ends of each pair of stub shafts is a magnetic screenU, designed to magnetically isolate the end faces of the shafts. Uponsaid stub shafts, the drums H, I, are journaled and are rotated throughthe medium of pulleys e, c, keyed on sleeves extending through the sidesof the case K of the separator. Upon the inner extremities of the stubshafts and within the drums, are located segments G, G', bearing IOOoppositely extending and relatively alternating polarized bars J, J, asshown most clearly in Fig. 2.

The drums and contained parts are located within the case K, and uponthe latter, a hopper L is provided for the introduction of the materialto betreated. Operating in connection with the hopper is a rotarycylinder M, for equally distributing the material transversely to thedrum H. A directing; plate N is pivotally suspended at one side ofthedrum H, and is movable by a screw hand shaft O, to adjust the positionof the plate and consequently control the amount of material operated onby the primary drum H. Stationary plates P, P, are provided beneath and.

between the drums H, I, to hold and direct the material in operativerelation with regard to said drums.

The relative position of the drums H, I, may be varied,a11d for suchpurpose the drum I is mounted on movable bearings R, R, adjustablethrough the medium of hand operated screw shaft S. The extent ofadjustments will depend upon the character of the material to betreated.

One manner of providing the adjustable bearingsR R, is by making thelegs a b, independent from the base and providing each leg with aninwardly extending, horizontal trunnion R', bearing in the magnet base,the openings in the casin g being sufficiently large to permit thedesired movement of the parts.

'l is an exhaust pipe for removing the tine dust or gangue from theapparatus.

As generally mentioned hereinbefore, the magnetized bars in the drum H,occupy a position whereby the series commences at the feed point f, andterminates at the pointf, where the metallic particles are acted on bythe second drum I. The series of magnetized bars of the latter begins atthe point for in advance of the same, and terminates at the point f2, orany suitable point beyond the latter.

In operation, the drums H, I, oppositely revolve as indicated by thearrows, and the ore delivered to the surface of the first drum isalternately exposed to the magnetized bars or poles of oppositepolarity, so that the metallic portions of the material are made toturn, releasing the gangue and non-metallic elements and allowing thelatter to llow into the discharge hopper g. The metallic particles onthe drum H, are carried to the point f', where they are released andengaged by the drum I, and the separating operation continued. Thegangue or non-metallic material carried past the hopper g, is liberatedor freed from the metallic particles when the latter pass to the drum,said liberated gangue or non-metallic material being directed to hoppert', by plate P. The separation eected by the drum I, will be mostcomplete, since, as before stated, the position of the magnetized barsor poles therein is such that the metallic particles are carried in adirection opposed to the natural gravital descent of the gangue ornon-metallic particles, with the result that clean headings will bedelivered at h.

The location of the magnetizing coils external to the drums H, I,secures the requisite magnetization of the bars J, J', and avoids theinconvenience of locating the coils within the drum.

I claim- 1. In a magnetic ore separator, the combination of a revolvinghollow drum, and aseries of stationary poles within the drum havingconstant opposite polarity, those of one side projecting froma pointatoneend of the drum, and those of the other side projecting from apoint at the opposite end of said drum toward and between one another,interlocking, and inducing coils outside of said drum, substantially asand for thepurpose described.

2. In a magnetic ore separator, the combination of a revolving hollowdrum, two interlocking segmental series of poles substantially asdescribed within said drum,and two horizontal supporting shafts whereonthe drumisjournaled,thesarneprojectingthrough the ends of said drum andbearing the respective series of magnets, and inducing coils outside ofsaid drum.

3. In a magnetic ore separator, the combination with a revolving hollowdrum, of two interlocking segmental series of poles of differentconstant polarity within said drum, two horizontal supporting shaftswhereon the drum is journaled, the same projecting through the ends ofsaid drum and bearing the respective series of magnets, a magneticscreen placed between said projecting ends, and inducing coils outsideof said drum, substantially as described.

4. In a magnetic ore separator, the combination with a revolving hollowdrum, of a segmental series of poles arranged within the same, inducingcoils therefor, feed and discharge hoppers, and an adjustable platearranged near to the periphery of said drum for controlling the supplyof material thereto, substantially as described.

5. In a magnetic ore separator, the combination of two parallel hollowdrums revolving near each other in opposite directions, and twoindependent segmental series of poles within the respective drums; theseries within the Iirst drum terminating at the part there of adjacentto the second drum, and the series in the second drum continuing in thecourse of rotation of said drum beyond the said adjacent part of thefirst drum,substantially as and for the purpose described.

6. In a magnetic ore separator, the combination of two parallel hollowdrums revolving near each other in opposite directions, two

independent segmental series of poles within the respective drums, theseries within the irst drum terminating at the part thereof adjacent tothe second drum, and the series in the second drum continuing in thecourse of rotation of said drum beyond the said adj acent part of thefirst drum, and means for adj usting the distance between the saiddrums, substantially as described.

7. In a magnetic ore separator, the combination of two parallel hollowdrums revolving near each other in opposite directions, a series ofstationary poles within each drum having constant opposite polarity,those of one side projecting from a` point at one end of the drum,andthose of the other side projecting from a point at the opposite endof said drum, toward and between one another, interlocking, inducingcoils for said poles, and means for adjusting the distance between thesaid drums, substantially as described.

8. In a magnetic ore separator, the combination of two parallel hollowdrums revolving near each other in opposite directions, a feed hopperabove the tirst drum a gangue discharge hopper beneath the same, asecond gangue discharge hopper beneath the second drum, an adjustableplate adjacent to the periphery of one of the drums, for delivering thegangue to the said discharge hoppers, and a segmental series of poleswithin the respective drums, arranged substantially as described.

9. The combination,in a magnetic ore .separator, of two parallel hollowrevolving drums,

two respective segmental series of stationary poles within the drums,each said series composed of sub-series ot' opposite polarity,stationary polar extensions projecting in the axes of said drums bearingthe said sub-series, and mounted upon magnetized legs of oppositepolarity, substantially as set forth.

l0. The combination, in a magnetic ore separator, of two parallelrevolving hollow drums, two respective segmental series of stationarypoles Within the drums, each said series composed of sub-series ofopposite polarity, stationary polar extensions projecting in the axes ofsaid drums bearing the said sub-series, and mounted upon magnetized legsof opposite polarity, the legs of one drum being pivoted at their base,and means provided to adjust the same, substantially as described.

In testimony whereof I affix mysignature in the presence of twowitnesses.

CHARLES G. BUCHANAN.

Witnesses: T. F. DrLLoN,

WM. H. STEGMAN.

